fastpedaller wrote:alexnharvey wrote:It is relatively common for there to be slight differences between the official ETRTO size (622-23, etc) and the other marked (marketing?) size, 700x25c and so on. Certainly Vittoria hypers had the same, the large ones are marked 622-40 and 700x38c.
I'd expect 700x25c and 622-25 to be on the same tyre though
OK. I am trying to tell you that despite your expectation it is quite common to find that they differ. No doubt some of the more knowledgeable posters will have explained exactly why this is, I recall it is something to do with the nominal width (ISO/ETRTO) differing from the actual width the manufacturer has measured and marked the tyre as being.